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Men in Kano, Nigeria, look around a house where a man and his pregnant wife were killed Tuesday in an attack witnesses said was carried out by security forces seeking members of Boko Haram. The sect has been blamed for an attack four days earlier that killed at least 185 people, but relatives said Tuesday's victims were not involved with it. Below, police officers collect undetonated soft-drink-can bombs recovered from the militants. (Associated Press)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.